It does look like scorch on the older leaves. Even if they weren't wet, it can get pretty hot in a greenhouse when the sun's out! The new leaves look lovely and healthy, so I wouldn't worry too much about the others.

I agree with Noisett47 and JWK looks like scorch. Looks like water droplets sitting on the leaf in the lower picture, this can be caused by overwatering see section Lumps and nodules appear on the foliage in the link supplied by Noisett47 these nodules release water then scorching occurs. overwatering also causes excessive transpiration causing water droplets to form in any dip in the leaves. Hope this helps